BaF2 Barium FluorideScintillators for Fast Timing Measurements

BaF2 scintillators are used for fast timing measurements where sub nanosecond time resolution is required. Supported applications include Positron Life Studies, Time of Flight (TOF) measurement, and Positron Emission Tomography (PET). Complete assemblies with crystal, light read out device, and front end electronics available from Berkeley Nucleonics.




Barium Fluoride (BaF2) scintillation crystals are characterized by a very fast scintillation emission with a decay time of 800 ps at 220 nm. The crystals produce both fast slow optical emission pulses. PMTs with Quartz windows are required for the readout of the crystal’s fast component. Typical time resolutions are 150 ps at 1 MeV per detector. BaF2 scintillators are radiation hard and are only slightly hygroscopic to long term exposure.




4.88 g/cc

Emission Maximum

220 nm (fast component)

310 nm (slow component)

Decay Time Constant

0.63 us

0.8 ns

Refractive Index

1.54 (220 nm)

1.50 (310 nm)

Conversion Efficiency (Relative to NaI)

5 (fast)

16 (slow)

Radiological Background

< 0.23 c/s/cc



Slightly (long term exposure)


Free Online Training Module - An Introduction to Scintillation Crystals and Detectors

Vist our Training page to access the module or for more information


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